mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2025-11-03 22:12:26 -06:00
233 lines
6.2 KiB
Go
233 lines
6.2 KiB
Go
// Copyright 2019 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package goobj
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import (
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"bytes"
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"github.com/twitchyliquid64/golang-asm/objabi"
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"encoding/binary"
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)
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// CUFileIndex is used to index the filenames that are stored in the
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// per-package/per-CU FileList.
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type CUFileIndex uint32
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// FuncInfo is serialized as a symbol (aux symbol). The symbol data is
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// the binary encoding of the struct below.
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//
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// TODO: make each pcdata a separate symbol?
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type FuncInfo struct {
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Args uint32
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Locals uint32
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FuncID objabi.FuncID
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Pcsp uint32
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Pcfile uint32
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Pcline uint32
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Pcinline uint32
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Pcdata []uint32
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PcdataEnd uint32
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Funcdataoff []uint32
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File []CUFileIndex
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InlTree []InlTreeNode
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}
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func (a *FuncInfo) Write(w *bytes.Buffer) {
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var b [4]byte
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writeUint32 := func(x uint32) {
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binary.LittleEndian.PutUint32(b[:], x)
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w.Write(b[:])
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}
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writeUint32(a.Args)
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writeUint32(a.Locals)
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writeUint32(uint32(a.FuncID))
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writeUint32(a.Pcsp)
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writeUint32(a.Pcfile)
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writeUint32(a.Pcline)
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writeUint32(a.Pcinline)
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writeUint32(uint32(len(a.Pcdata)))
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for _, x := range a.Pcdata {
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writeUint32(x)
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}
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writeUint32(a.PcdataEnd)
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writeUint32(uint32(len(a.Funcdataoff)))
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for _, x := range a.Funcdataoff {
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writeUint32(x)
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}
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writeUint32(uint32(len(a.File)))
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for _, f := range a.File {
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writeUint32(uint32(f))
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}
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writeUint32(uint32(len(a.InlTree)))
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for i := range a.InlTree {
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a.InlTree[i].Write(w)
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}
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}
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func (a *FuncInfo) Read(b []byte) {
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readUint32 := func() uint32 {
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x := binary.LittleEndian.Uint32(b)
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b = b[4:]
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return x
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}
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a.Args = readUint32()
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a.Locals = readUint32()
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a.FuncID = objabi.FuncID(readUint32())
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a.Pcsp = readUint32()
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a.Pcfile = readUint32()
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a.Pcline = readUint32()
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a.Pcinline = readUint32()
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pcdatalen := readUint32()
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a.Pcdata = make([]uint32, pcdatalen)
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for i := range a.Pcdata {
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a.Pcdata[i] = readUint32()
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}
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a.PcdataEnd = readUint32()
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funcdataofflen := readUint32()
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a.Funcdataoff = make([]uint32, funcdataofflen)
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for i := range a.Funcdataoff {
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a.Funcdataoff[i] = readUint32()
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}
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filelen := readUint32()
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a.File = make([]CUFileIndex, filelen)
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for i := range a.File {
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a.File[i] = CUFileIndex(readUint32())
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}
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inltreelen := readUint32()
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a.InlTree = make([]InlTreeNode, inltreelen)
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for i := range a.InlTree {
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b = a.InlTree[i].Read(b)
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}
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}
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// FuncInfoLengths is a cache containing a roadmap of offsets and
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// lengths for things within a serialized FuncInfo. Each length field
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// stores the number of items (e.g. files, inltree nodes, etc), and the
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// corresponding "off" field stores the byte offset of the start of
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// the items in question.
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type FuncInfoLengths struct {
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NumPcdata uint32
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PcdataOff uint32
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NumFuncdataoff uint32
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FuncdataoffOff uint32
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NumFile uint32
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FileOff uint32
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NumInlTree uint32
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InlTreeOff uint32
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Initialized bool
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}
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func (*FuncInfo) ReadFuncInfoLengths(b []byte) FuncInfoLengths {
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var result FuncInfoLengths
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const numpcdataOff = 28
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result.NumPcdata = binary.LittleEndian.Uint32(b[numpcdataOff:])
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result.PcdataOff = numpcdataOff + 4
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numfuncdataoffOff := result.PcdataOff + 4*(result.NumPcdata+1)
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result.NumFuncdataoff = binary.LittleEndian.Uint32(b[numfuncdataoffOff:])
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result.FuncdataoffOff = numfuncdataoffOff + 4
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numfileOff := result.FuncdataoffOff + 4*result.NumFuncdataoff
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result.NumFile = binary.LittleEndian.Uint32(b[numfileOff:])
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result.FileOff = numfileOff + 4
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numinltreeOff := result.FileOff + 4*result.NumFile
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result.NumInlTree = binary.LittleEndian.Uint32(b[numinltreeOff:])
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result.InlTreeOff = numinltreeOff + 4
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result.Initialized = true
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return result
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}
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func (*FuncInfo) ReadArgs(b []byte) uint32 { return binary.LittleEndian.Uint32(b) }
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func (*FuncInfo) ReadLocals(b []byte) uint32 { return binary.LittleEndian.Uint32(b[4:]) }
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func (*FuncInfo) ReadFuncID(b []byte) uint32 { return binary.LittleEndian.Uint32(b[8:]) }
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// return start and end offsets.
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func (*FuncInfo) ReadPcsp(b []byte) (uint32, uint32) {
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return binary.LittleEndian.Uint32(b[12:]), binary.LittleEndian.Uint32(b[16:])
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}
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// return start and end offsets.
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func (*FuncInfo) ReadPcfile(b []byte) (uint32, uint32) {
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return binary.LittleEndian.Uint32(b[16:]), binary.LittleEndian.Uint32(b[20:])
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}
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// return start and end offsets.
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func (*FuncInfo) ReadPcline(b []byte) (uint32, uint32) {
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return binary.LittleEndian.Uint32(b[20:]), binary.LittleEndian.Uint32(b[24:])
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}
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// return start and end offsets.
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func (*FuncInfo) ReadPcinline(b []byte, pcdataoffset uint32) (uint32, uint32) {
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return binary.LittleEndian.Uint32(b[24:]), binary.LittleEndian.Uint32(b[pcdataoffset:])
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}
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// return start and end offsets.
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func (*FuncInfo) ReadPcdata(b []byte, pcdataoffset uint32, k uint32) (uint32, uint32) {
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return binary.LittleEndian.Uint32(b[pcdataoffset+4*k:]), binary.LittleEndian.Uint32(b[pcdataoffset+4+4*k:])
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}
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func (*FuncInfo) ReadFuncdataoff(b []byte, funcdataofffoff uint32, k uint32) int64 {
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return int64(binary.LittleEndian.Uint32(b[funcdataofffoff+4*k:]))
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}
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func (*FuncInfo) ReadFile(b []byte, filesoff uint32, k uint32) CUFileIndex {
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return CUFileIndex(binary.LittleEndian.Uint32(b[filesoff+4*k:]))
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}
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func (*FuncInfo) ReadInlTree(b []byte, inltreeoff uint32, k uint32) InlTreeNode {
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const inlTreeNodeSize = 4 * 6
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var result InlTreeNode
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result.Read(b[inltreeoff+k*inlTreeNodeSize:])
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return result
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}
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// InlTreeNode is the serialized form of FileInfo.InlTree.
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type InlTreeNode struct {
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Parent int32
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File CUFileIndex
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Line int32
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Func SymRef
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ParentPC int32
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}
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func (inl *InlTreeNode) Write(w *bytes.Buffer) {
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var b [4]byte
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writeUint32 := func(x uint32) {
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binary.LittleEndian.PutUint32(b[:], x)
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w.Write(b[:])
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}
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writeUint32(uint32(inl.Parent))
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writeUint32(uint32(inl.File))
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writeUint32(uint32(inl.Line))
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writeUint32(inl.Func.PkgIdx)
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writeUint32(inl.Func.SymIdx)
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writeUint32(uint32(inl.ParentPC))
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}
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// Read an InlTreeNode from b, return the remaining bytes.
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func (inl *InlTreeNode) Read(b []byte) []byte {
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readUint32 := func() uint32 {
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x := binary.LittleEndian.Uint32(b)
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b = b[4:]
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return x
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}
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inl.Parent = int32(readUint32())
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inl.File = CUFileIndex(readUint32())
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inl.Line = int32(readUint32())
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inl.Func = SymRef{readUint32(), readUint32()}
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inl.ParentPC = int32(readUint32())
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return b
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}
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